Fredric edholm



F EDHOLM REGULATING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED IMR. 28. I9I9- Patented Oct. 28, 1919.

FREDRIG EDHOLM, OF ESKILSTUNA, SWEDEN.

REGULATING DEVICE FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Oct. 28, 1919. 7

Application filed March 28, 1919. Serial No. 285,940.

To all whom it may concern Be it, known that I, FREDRIC EDHOLM, a citizen of the Kingdom of Sweden, residing at Eskilstuna, Sweden, have inventednew and useful Improvements in Regulating Devices for Internal-Combustion Engines, of which the following is a specification.

This invention relates to a regulating device for internal combustion engines having a fuel supply pump, the object of the nvention being to provide a regulating device for such engines in which one stroke of the fuel supply pump is efiected by means of a cam disk attached to a power shaft while the opposite stroke of the pump is eflected by a spring and limited by a conical sleeve mounted on said shaft and adjustable along the same under the control of a governor in order that the governor may be subjected to load arising from the pump during part of one stroke of the pump only.

In the accompanying drawing forming part of this specification, Figure 1 shows a sectional elevation of one embodiment of the invention. Fig. 2 shows certain parts of this embodiment in top plan view. Fig. 3 shows a sectional elevatlon of another embodiment of the invention.

In the embodiment shown in Fig. 1, 1 indicates a power shaft and 2 a stationary casing through which the shaft 1 extends. Mounted in said casing to move in a direction at right angles to the shaft 1 is a slide 3 recessed in its outer end to receive the'plun er 4 of a fuel supply pump 5, said plunger eing maintained in contact with the bottom of said recess by means of a spring 6 confined between a shoulder 20 formed on the casing 2 and a collar 21 on the plun er 4. Mounted in the slide 3 is a bolt 7 w ich forms the journal shaft of a cylindrical roller 8 situated over against a cam disk 9, attached to the shaft 1 the form of which will be seen from, Fig. 2. The slide 3 further carries a journal pin 10 for a conical roller -1l,situ

ated over against a correspondingly conical sleeve 12 the base of which is directed oppositely tothat of the roller 11. The sleeve 12 is mounted on the shaft 1 to be displaced longitudinally thereon. A ring 120' loosely mounted in an annular groove in the sleeve 12 is connected to a rock lever 13 adapted to be connected with a governor, not shown.-

Mounted on the casing 2 is a lever- 15 by means of which the slide 3 may be operated manually.

Assuming the shaft 1 rotates in the direction of the arrow shown in Fig. 2, the device above described operates as follows: With the position of the roller 8 shown in Fig. 2, the cam disk 9 will first touch the roller 8 in the point a, whereupon the cam disk displaces the roller 8 and thus also the slide 8 with the pump plunger 4 outwardly in opposition to the spring 6 until thepomt-b touches the roller 8. The said displacement effects the pressure stroke of the plunger. While the portion. b c d of the circumference of the disk 9 concentric to the shaft 1 bears against the roller 8 the plunger 4: Will be maintained in its extreme inner position relatively to the pump cylinder 5 and will be successively-returned to its outer end posltion by means of the spring 6 after the point (i has come into contact with the roller 8. Said movement, viz. the suction stroke of the plunger, proceeds until the roller 11 encounters the conical sleeve 12which is maintained in a positionqcorresponding to the actual load of the engine by means of the governor. While the roller 11 engages with the sleeve 12 no change takes place in the movement of the plunger unless a change, in the load of the 'engine'efi'ects an adjustment of the sleeve. When the roller 8 is again brought into contact with the cam disk 9 at ornear the point a, the roller 11 is removed from the sleeve 12 by the move? ment of the slide 3.' The engagement be tween the roller 11 and the sleeve 12 will thus exist during only a small part of each revolution of the shaft 1 the sleeve 12 being freely adjustable by means of the governor during the restof each revolution.

As the counteracting effect of the device on the operation of the governor depends on the axial pressure component of the roller 11 on thesleeve 12, it is'obvious that by using a small pitch for the roller 11 and the sleeve 12 and by using a spring 6 the pressure of which is not greater than is necessary to overcome the suction resistance of the pump during the period the 'circumiferential portion d.a of the .cam disk is in engagement with the roller 8, the said counteracting effect on the governor may be 7 reduced to a very small value.

The embodiment shown in Fig. 3 differs from. that above described onlv therein that the conical roller 11 is mounted in a separate slide 14 which is caused to bring the roller 11 into engagement with the sleeve 12 by the action of the slide 3, whereas the said slide 14 does not move with the slide 3 in the direction from the shaft 1.

I claim 1. A regulating device for internal combustion engines, comprising a fuel supply pump, having a reciprocating plunger, a power shaft, a cam disk on said shaft, a conical sleeve slidably mounted on said shaft, a slide for operating said pump plunger in one direction, a spring for moving the plunger in the opposite direction, a cylindrical roller on said slide for engagement with said cam disk and iii conical roller on said slide for engagement with said conical sleeve.

2. Regulating device for internal combustion engines, comprising a fuel supply pump having a reciprocating pump plunger,

a power shaft, a cam disk on said shaft, a

conical sleeve on said shaft, means "for adj usting said sleeve along the shaft according to the load of the engine,-a slide for operewes? ating said pump plunger in one direction, a spring for moving the plunger in the opposite direction, a cylindrical roller on said slide for engagement with said cam disk, and a conical roller on said slide for engagpment with said conical sleeve.

1 3. egulating device for internal combustion engines, comprising a fuel supply pump, having a reciprocating plunger, a power shaft, a cam disk on said shaft, a conical sleeve slidably mounted on said shaft, a

slide for operating said plunger in one direction, a spring for moving the plunger in the opposite directiom'a cylindrical roller on said slide for engagement with the cam disk, a conical roller on said slide for en-- gagement with said conical sleeve, a housing surrounding said elements, and a guideway' formed in said housing for the said slide.

In testimony whereof I have signed my name.

FREDRIC EDHOLM. 

